3 month old DS had his second round of immunisations yesterday and is a bit out of sorts today. He feels warmer than usual to the touch so I took his temperature using an underarm thermometer and it was 37. I can only find conflicting information online - some places say a fever is 37.5 or higher, others say that when using a digital thermometer under the arm a fever is over 36.4. Am wondering whether to give him Calpol now. The nurse said only if he has a fever but I can't figure out whether he has one or not! Hope the more experienced mums on here can help?